Collocations Complete the sentences with suitable expressions from the collocation box. Sometimes more than one collocation is possible. Adj + route: direct, alternate, entire, main, same, new Adj + encounter: close, last, brief, final, initial Encounter + N: problem, difficulty, obstacle extend + N: life, length, range, scope, reach With the merging of the railroads, only the Union Pacific Railroad and the BNSF Railway remain to carry the ______.